A Hard-Tuned ("Abnormal") Series can too sometimes, but often you're more likely to lose.
In this one
http://www.geocities.com/gt2toxs/gt/logs/gt1-tuned.txt
I actually document getting to Cr36,026,202 in 1580 days.
Lets see,
Cr1,000,000,000 would need a minimum of about 15,000 game days.
The nearly two billion claimed by Flycar about 30,000 game days.